Auxiliary water heater



Aug. 20, 1929. J. E. ERcANBRAcK AUXILIARY WATER HEATER Filed Aug. 9, 1926 zzz/0r' ,H l Q www Patented Aug. 20, 1929.

UNITED STATES i .i JOHN EDWARD ERCANBRACK, F CHICGO, ILLINOIS.

PATENT OFFICE.

AUXILIARY WATER HEATER.

My present invention relates to the provision of an auxiliary water heater particularly adapted for attachment to boilers emattachment is made to the boiler at two sepav of the main boiler system, that is, after it has rated points both below the water level of the boiler and is arranged to provide a continuous pitch in the circulation from the boiler through the heating tubes in the tank and back to the boiler. 'A part of the circulation from the boiler is enclosed in a hot;

water storage tank connected both with the water servicelsupply pipe and the service distribution system of the premises to be supplied with hot water whereby the .water passing from the service Supply pi'pe through the storage tank will be heated in the tank bythe circulation from the boiler.

I also arrange a connection for' the return performed the work for which it was pri.- marily intended, with the header leading to the tank circulation whereby the drain on the boiler is reduced and the heat 1which remains in the condensation and return is utilized underv normal conditions for the heating of the water supply in my auxiliary heater. In order to effect the above` arrangement I have had to provide means to pre- ,vent the How from the 4boiler and the How from the' boiler return from interfering or blocking .each other.

In the carrying out of my invention I have designed a head for the tank with which the boiler makes connection, which has a large' capacity of flow and is easily opened for purposes of clean out or repair.; f

The pitch of the circulation of water to the auxiliary heater from and back to the boiler is of great importance because while the difference in weight of cool and heated water is enough to create a circulation, thel pitch bi'y reason of its abruptness or otherwise, e ects the rapidity of the circulation and thereby the efliciency of the auxiliary heater and also permits me to utilize effectively the return from the ,boiler system as an effective source of heat.

I have attained the above mentioned ob- .Ap'pncation nledwaugust s, 192e. serial no. 128,188.

jects and secured the above referred to results bymeans of the structure illustrated in the accompanying drawings, in which:-

Fig. 1 Ais la plan of a. boiler with my auxiliary water heater connected therewith.

Fig. 2 is a front (elevation of the struc-ture s own in Fig. 1. Fig. 3 is a side elevation of the structure shown in Figs. 1 and 2, and

Fig. 4 is a ragmental section ofa tank and head with which head the boiler coni nections'are made.

Similar reference characters refer to similar parts through the respective views.

The main boiler illustrated is of the `conventional fire box type consisting of the-forward or body portion, l, in which is the fire box, 2, which main body portion rests on an ash pit structure, 3. Extending real:- wardly from the main body portion, 1, of the boiler islthe tube portion, 4. Upon one side of lthe main body portion, 1, of the boiler and below the normal water line of the boiler is provided a bo'red and tapped embossment, 5,'which may be secured to the boiler in'accordance with any known lpractice of 'making such connections. Boilers of the typeherein illustrated have usually provided therein, at a point on the back of the main body portion, 2, ljust below. the tube portion, 4, a like embossment, 6, with which it is the present practice to make connectionv to the return of the main` system to which the boileris attached. f

My auxiliary water heater consists of a` heating and'storage tank, 7, which I have iillustrated as'of the horlzontally disposed ,type. The tank, 7, is provided vwith bored and tapped embossments, 8 and 9, through which respectively are made the connections quired capacity. I have shown the end plate l of the tank about the aperture, 10, as flat and against the Hat portion of the'V head of the tank surrounding the aperture 10 is placed a tube plates in which tubes 13 are inserted and headed over.

I have shownparticularly in Fig. 2 three vertical ranks of such tubes, each vertical rank comprising two U tubes. The pitch, as shown in Fig. 3, is carefully maintained in the tubes 13 so that the auxiliary circulation from and to the boiler will readily relieve itself of air liberated from the water.

Around the face at the periphery of the tube plate 12 is another gasket 15 and secured against the gasket 15 is the header casing 16. Themeans of securing these parts together are preferably stud bolts 17 on the outerends of whichv are screwed nuts 18. Running horizontally across the header casing 16 and between the upper and lower six tube" groups of pipes is a partition 19, dividing the header into an upper chamber 20 and a lower chamber 21. From either side of the upper chamber 20 are provided suitable threaded pipe connections 22 and 23 respectively. From the bottom of chamber 20 leads a suitable pipe connection 24.

The front of he casing 16 is open to afford y'access to chambers 20 and 21 and these openings are closed by a face plate 25 secured in position by headed bolts 26. Connection is made through pipe 27 running from embossment 5 to the pipe connection 22 and the tank is so set with relation to the boiler that this pipe 27 is given the desired downward pitch from` the boiler to the tank connection. 'Connection is also made between the threaded embossment 6 on the boiler and the pipe connection 24 on the head'which is so connection 23 on thehead which 'is just op` posite to the connection from the upper portion of the boiler and to prevent' the return through pipe 29 from interfering with the flow from the boiler I provide the baiile 30,

which extends from the face plate l25 su cientlyiar into the chamber 2O so as to interfere with a direct flow between the openings 22 and '23.

The 'details o f the internal circulation of boilers are not'I always thoroughly understood but the-principles controlling such a circulation are well known. That is, the

gravitation or falling of the cooler bodies of water in the boiler force the hotter bodies of Water in immediate contact with the heating surfaces upwardly to the top of the boiler, and it is further known that the rapidity of the internal 'boiler circulation effects the amount of heat, or number of B. t. u.s, ab-

sorbed by the water from the heating sury faces.

The phenomenon of the rising and falling of the water in the boiler in accordance with its diference of temperature in connection with the pitch of the boiler circulation through the auxiliary tank will insure a moderatefflow of heated water through the tubes 13 in the tank'atall times. But when the water in the tank outside of tubes 13 is colder than the boiler water, both the auxiliary circulation through the tank and the internal circulation through the boiler will be accelerated. This improves the internal circulation of the boiler and increases the absorption of heat therein.

I-t will also be noted that the return connection from the main boiler. system is made through pipe connection 23 with the head 16, and this condensation helps materially to supply the heat extracted in the auxiliary tank so that when but little water is being drawn from -the tank, the return supplies about` all the heat that is required to keep the supply of water in the tank at the desired temperature. Not only do I utilize the heat in the return from the main boiler system, 'but by attaching this return at a point where a circulation i's normally taking place, the interior circulation of the boiler is `not only accelerated but the exterior boiler circulation is also rendered more uniform and constant and subject to less fluctuation.

In warm weather where the main boiler, if employed for heating, would be run very low, the absorption in the auxiliary boiler is not excessive, but under normal operation the increase in internal boiler circulation and the steadying of the external boiler circulation is so helpful to the operation of the main boiler that the absorption of heat in the auxiliary water heater is substantially withf out additional co'st. c-

Having described my invention, what I claim as new and desire to secure by Letters Patent, is-

1. ,In combination with a boiler a tank having inlet and outlet ports therein and provided with an aperture .in one end near thebottom thereof, a tube plate registering A with said aperture, U tubes in .vertical ranks extending from said plate through said aperture into said tank, an exterior head provided with upper and lower chambers with which the upper and lower ends of said tubes respectively communicate, ports upon oppomames l 3 boiler to the chamber.

2. In combination with a boiler a tank having inlet and outlet ports therein and other port Vof-"said upper provided with an aperture in one end near the bottom thereof, a tube plate registering with said aperture, U tubes 1n vertical ranks extending from said plate through said aperture into said tank, an exterior head 10` provided with upper and lower chambers with which the upper and lower ends of said tubes respectivel communicate, ports upon opposite sides o said upper chamber and a single port in the bottom of said lower chamber, a conduit establishing communication between said boiler and one of the ports in said upper chamber, a conduit establishing communication between the port in said lower chamber and said boiler and a lreturn pipe from the primary circulation of said boiler to the other port of said u per chamf ber, and a baille in said upper c `amber between the respective ports thereof.

3. A. water heater comprising a boiler, an

auxiliary boiler water circulation consisting rounding said heat transfer tubes and having inlet and outlet ports therein, and a primary exterior boiler circulationconsisting of tubes the return whereof communicates with and includes saidheat transfer tubes.

4. A water heater comprising a boiler, an

auxiliary boiler water circulation consisting of tubes leading from and returningto said boiler and including a series of heat transfer tubes located wholly below the Water level of said boiler, a storage tank surrounding said heat transfer tubes and having inlet and outlet ports therein, and a primary boiler circulation consisting of tubes, the return whereof communicates with and includes said heat transfer tubes.

JOHN EDWARD ERCA'NBRACK. 

